import java.util.Scanner;

class TreeNode {
    char val;
    TreeNode left;
    TreeNode right;
    TreeNode() {}

    TreeNode (char val) {
        this.val = val;
    }
}
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            String str = in.nextLine();
            TreeNode root = createTree(str);

            inOrder(root);

        }
    }

    public static int i = 0;
    public static TreeNode createTree(String s) {
        TreeNode root = null;
        if(s.charAt(i) != '#') {
            root = new TreeNode(s.charAt(i));
            i++;
            root.left = createTree(s);
            root.right = createTree(s);
        }else {
            i++;
        }
        return root;
    }

    public static void inOrder(TreeNode root) {
        if(root == null) {
            return;
        }
        inOrder(root.left);
        System.out.print(root.val + " ");
        inOrder(root.right);
    }
}